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Jitter Article & Listening Tests-With Music Files

Posted by Jon Risch (B) on August 19, 2013 at 19:34:11

A very interesting article on Jitter was in the August Pro Sound News, by Dave Hill, "A Matter of Time: The Audibility of Clock Jitter" P34-35, cont'd on page 39.

A copy of the article is at:
http://cranesong.com/A_Matter_%20Of_Time_The%20_Audibility_Of_Clock_Jitter.pdf

Files of the same music track with varying amounts of CLOCK jitter added are at:
http://cranesong.com/jitter_1.html
You are supposed to download the files, and burn a CD of them to listen on your main system, not necessarily to listen at the computer.

Even more interesting, are tracks with the DIFFERENCE files of the various tracks versus the "original", are at:
http://cranesong.com/jitter_2results.html

This page includes the "reveal" of the various A thru E tracks at the 1st page, so if you want to listen to the A thru E tracks "blind", don't go to the second page till listening to the files downloaded from the 1st page.
The second page also has an interesting graph, as well as PDF documents of the test set-up, etc.

For your interest and by way of a challenge, I was able to hear definite differences on one track versus others, and thought that I could hear differences on two of the other three tracks. I also successfully picked out what I thought was the reference track versus the "altered" tracks.

The very interesting part is that the levels of jitter involved are all well below what most naysayers tout as being audible. By at least an order of magnitude, and more.

Listen for yourself and see what you think. Remember, this is simulated master clock jitter, and does not include the contribution from your own playback system. This then raises the question of how can we possibly hear such low levels of jitter, if our playback system jitter is higher and masking the amount in the jittered file?


Jon Risch

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